
Ricardo BerbaraFederal Rural University of Rio de Janeiro | UFRRJ · Department of Soils
Ricardo Berbara
PhD
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176
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Introduction
Publications
Publications (176)
Septate endophytes proliferating in the roots of grasslands' plants shed doubts on the importance of arbuscular mycorrhizal (AM) symbioses in dry soils. The functionality and diversity of the AM symbioses formed in four replicates of three adjacent plant communities (agricultural, native, and restored) in Grasslands National Park, Canada were asses...
Aims We used a Procrustean superimposition approach associated with regression analysis to test hypotheses regarding the relationship between plant communities and distinct below-ground compartments—soil chemis-try (SC) and soil microbial activity (SMA). Additionally, we evaluated litter chemical quality as an interface be-tween the above and below...
Humic substances (HS) contained in the vermicompost, are environmentally friendly materials that
restore the chemical and physical properties of soils and improve plant growth. The work described
herein was aimed at studying the HA–root interactions and their relationship with some components of
antioxidative metabolism in rice (Oryza sativa L.). T...
The correlation of multivariate data is a common task in investigations of soil biology and in ecology in general. Procrustes analysis and the Mantel test are two approaches that often meet this objective and are considered analogous in many situations especially when used as a statistical test to assess the statistical significance between multiva...
Knowledge of the structure-property-function relationship of humic substances (HSs) is key for understanding their role in soil. Despite progress, studies on this topic are still under discussion. We analyzed 37 humic fractions with respect to their isotopic composition, structural characteristics, and properties responsible for stimulating plant r...
Organic composts such as "bokashi", obtained from the fermentation of bran mixtures and inoculated with microorganisms, improve soil characteristics. In Brazil, the most widely used formulation for the production of this compost is obtained from a mixture of wheat and castor bean bran, but both have a high monetary cost. Replacing these components...
Humified organic matter has been shown to decrease Pb toxicity in plants. However, there are still gaps in our understanding of the mechanism by which this phenomenon occurs. In this study, we aimed to assess the ability of humic substances (HSs), humic acids (HAs), and fulvic acids (FAs) to enhance defense mechanisms in rice plants under lead (Pb)...
The red alga Kappaphycus alvarezii (Rhodophyta) is one of the most cultivated species in the world. Extracts obtained from Kappaphycus (KAlv-sap) have been shown to promote plant growth as well as defense against abiotic stresses. The present study aimed to examine the regulation of photosynthesis and the genetic and metabolic mechanisms resulting...
Este artículo reflexiona sobre la idea de autonomía universitaria y pone en relieve su construcción social y sus múltiples dimensiones históricas, epistemológicas y políticas. Asimismo, ilustra el contexto y las formas en que se manifiesta hoy en la Argentina, Brasil y México, según sus principales actores académicos. Se construyeron algunos indica...
O objetivo deste trabalho foi identificar a ocorrência de macrofungos comestíveis na Unidade de Conservação (UC) Floresta Nacional (FLONA) Mário Xavier, no município de Seropédica, RJ (Brasil). Foi realizado isolamento in vitro para cultura do micélio e posterior inoculação em substratos em testes para desenvolvimento dos fungos. Analisaram-se 12 m...
The aim of the present study was to examine, for the first time, a possible relationship between the biological activity and the nutrient content in different parts of Vernonia scorpioides. Nitrogen, potassium and phosphorous concentrations were measured in extracts from roots, stalks and leafs. Although, extracts from roots, produced the highest a...
Fermented composts obtained from a mixture of raw materials and a microbial inoculant, known as “bokashi,” are alternatives used by many farmers worldwide. We evaluated the chemical composition, fermentation pathways, N availability, and agronomic efficiency of fermented compost obtained from different plant-based raw materials. The standard compos...
Fermented composts obtained from a mixture of raw materials and a microbial inoculant, known as “bokashi,” are alternatives used by many farmers around the world. We evaluated the chemical composition, fermentation pathways, N availability, and agronomic efficiency of fermented compost obtained from different plant-based raw materials. The standard...
Salinity induces salt uptake by plant cells, which hinders plant growth and results in decreased agronomic crop yields. Humic substances (HSs) have been shown to be ecological agricultural alternatives to stimulate plant development under both normal and abiotic stress conditions. At the same time, arbuscular mycorrhizal fungi (AMF) provide nutrien...
The structure of humic substances (HSs) and the humification process are critical topics for understanding the dynamics of carbon on the planet. This study aimed to assess the structural patterns of 80 humic acid (HA) samples isolated from different soils, namely, Histosols, Ferralsols, Cambisols, Mollisols, Planosols and vermicompost, by spectrosc...
Como forma de melhor atender as demandas de ensino e pesquisa voltadas ao desenvolvimento do setor agrícola, diferentes instituições públicas brasileiras têm investido na certificação de qualidade com a adoção da norma internacional ISO 9001. O objetivo deste trabalho foi analisar as condições existentes no Setor de Grandes Culturas (SGC) do Depart...
The objective of this study was to identify communities of arbuscular mycorrhizal fungi (AMF) in soils under pasture, silvopasture, and Cerrado forest ecosystems, and evaluate the effects of land use system, soil texture, and seasonality on the dynamics of AMF communities, in Alta Floresta D'Oeste, Rondônia, Brazil. Samples of the soil 0-20 cm laye...
Humic acids (HA) stimulate the growth of several plant species by regulating their hormonal and redox metabolisms. Nevertheless, studies on their relationship with the plant-associated microbiota are almost nonexistent. Here, we hypothesized that the HA effect occurs in parallel with the regulation of the plant-associated bacterial community. Rice...
Understanding the dynamics of soil organisms in natural environments can be very useful for determining the quality of forest and agricultural ecosystems. This study aimed to assess arbuscular mycorrhizal fungal (AMF) communities in pasture and regenerating riparian forest sites in Guajará-Mirim, Rondônia, Brazil. Ten soil samples were randomly col...
White-rot fungi (Pleurotus eryngii) are decomposers of lignocellulosic substrates. The relationship between the structure of humified organic matter and P. eryngii growth, is poorly understood. This study aimed to evaluate the relationship between the growth and development of white-rot fungi (P. eryngii) in two structurally different sources of hu...
Environmental filtering and niche differentiation are often invoked to explain species coexistence at local scales. The ironstone campo rupestre of Brazil provides a biodiverse natural experiment in which edaphic gradients represent filters to test the hypothesis that plant community functional composition, despite converging on extreme stress tole...
Chemical eustressors induce a eustress state "positive stress" increasing the resistance and improve the plant growth. The potentiality of humic acids (HA) to act as a eustressor has been scarcely explored. The present study aims to evaluate how HA with different structural characteristics induce differently, a eustress state in rice plants through...
Dark septate endophytes (DSEs) constitute a polyphyletic group within the Ascomycota, with global distribution and a wide range of host plant species. The present study evaluated the diversity of DSE in sugarcane roots of the varieties RB867515, RB966928, and RB92579, and four varieties of not commercialized energy cane. A total of 16 DSE strains w...
Apesar de conhecida a importância de produtos alcalinos na degradação de fibras, pouco se conhece sobre os efeitos do calcário durante o processo de compostagem. Diante disso, o objetivo deste trabalho foi avaliar o efeito da adição de diferentes doses de calcário sobre o pH, condutividade elétrica (CE), densidade em base seca, emissões de CO2 e de...
A adição de calcário durante o processo de compostagem é um procedimento relatado em algumas publicações técnicas e por alguns produtores, contudo, são escassos os resultados de pesquisa que descrevem seus efeitos sobre o processo de compostagem e produção de substratos. A utilização de substratos formulados com compostos orgânicos, em substituição...
Humic acids (HAs) stimulate the growth of several plant species by regulating their hormonal and redox metabolisms. Nevertheless, studies on the relationship of these substances with the plant-associated microbiota are almost nonexistent. Here, we hypothesized that the effect of HAs occurs in parallel with the regulation of the plant-associated bac...
Diversity of arbuscular mycorrhizal fungi (AMF) in banana and plantain fields in western Cuba is here reported. Thirty rhizosphere soil samples were collected and used for direct evaluation of the AMF community and establishment of trap cultures. AMF spores were extracted from the soil samples by wet sieving and decanting, and species were identifi...
Sugarcane burning has been widely practiced in Brazil and worldwide. In the long term, this farming practice can cause soil erosion, reduction in organic carbon (OC) and consequently, changes in the structure of soil organic matter (SOM). Such changes may be difficult to reverse. This study aimed to assess the medium- and long-term effects of sugar...
Due the Fungi of Basidiomycetes class plays an important role in the carbon cycling in the soil and use soil organic compounds for carbon metabolism was necessary a study to understand your act and demand on these sources. In this context two species deserve
mention due to their time of use and popularization being them Pleurotus ostreatus which is...
The structural identity of humic substances (HS) in the soil is a highly debated issue in the soil sciences. Although the complexity and structural characteristics that determine the functions of HS justify their further study, there is enough scientific evidence explaining the presence of these compounds as a group of structures that are formed by...
This study evaluates the interaction effects on corn (Zea mays L.) growth between intact humic substances (HS) extracted in an alkaline medium from three different origins (an Organosol [HS‐Org], an Andisol [HS‐And], and vermicompost [HS‐Vc]) and the arbuscular mycorrhizal fungus (AMF) Dentiscutata heterogama. The HS were characterized by spectrosc...
The effects of humic substances (HS) on plants are related to humic structure. The present study aimed to characterize HS different origins and to evaluate the effects on germination and protective effects against salt stress in corn. HS were extracted from an Andosol -Ecuador (HSAnd), Histosol -Brazil (HSHist) and vermicompost (HSVc) and character...
Purpose
The beneficial effects of liquid humus applied to plants are well reported in the literature; however, studies of liquid humic application in the production and quality of garlic culture are practically nonexistent. The objective of this work was to evaluate the effects of foliar application of a liquid humic extract from vermicompost (HEVC...
Availability of fresh water for crop irrigation is becoming scarce and rather expensive. In this context, the research about the potential reutilization of non-conventional water sources becomes highly relevant, principally in arid and semi-arid areas. On many occasions these new water resources involve water with a moderate concentration of salt,...
The arbuscular mycorrhizal fungi (AMF) are important organisms with enormous potential for use in ecological restoration due to their positive association to seedlings. We evaluated the effects of soil degradation on a species-rich AMF community that could hinder the restoration of rupestrian grassland sites whose soil had been removed. Soil sample...
Este trabalho teve como objetivo avaliar a abundância e diversidade de fungos micorrízicos arbusculares (FMA), bem como a produção de proteína do solo relacionada à glomalina (PSRG) (GT- glomalina total; GFE – glomalina facilmente extraível) em ecossistemas de Mata Seca no Norte de Minas Gerais. As amostras de terra foram coletadas em áreas com dif...
The understanding of humic substances (HS) chemistry in soil science faces new challenges at present. Theories alternative to humification (HS formation process) have been presented to scientific community propagating uncertainty about the existence of these compounds as a structural entity located in the soil. In this review, we aim to show in a c...
Carbon (C) stabilization and the quality of soil organic matter (SOM) in a tropical climate are key aspects regulating carbon dioxide emissions and maintaining the C cycle. Soil management influences the accumulation of C, regulating the balance between mineralization and/or the humification of SOM. This study aimed to quantify inputs of different...
At the Brazilian Amazon forest, studies were carried out to estimate the community of arbuscular mycorrhizal fungi (AMF), from this it was used a bioassay of dilutions of samples collected from preserved and regenerated areas after bauxite extraction. To regenerate areas, tree species were introduced and samples were taken after 2, 6, 12, and 16 ye...
The present study aimed to select efficient arbuscular mycorrhizal fungi (AMF) for sugarcane growth and P nutrition in four soils that spontaneously contained dark septate endophytes (DSE). The effect of nine AMF isolates was evaluated individually in sugarcane presprouted seedlings (SP81-3250) grown under greenhouse conditions for a 120-day period...
Purpose
The use of humic substances (HS) in agriculture is beneficial and has positive environmental impacts. However, to optimize the use of HS possible links between their structural characteristics and bioactivity must be shown. The goal of this study is to evaluate the bioactivity of different humic fractions extracted from vermicompost (VC) in...
Este trabalho teve por objetivo a obtenção de raízes transgênicas (hairy roots) de Piper hispidinervium (pimenta-longa), espécie reconhecida pela produção de óleo essencial rico em Safrol, metabólito secundário utilizado com fins terapêuticos e industrial. As raízes foram produzidas a partir da infecção de explantes in vitro de pimenta-longa com Ag...
Sandy soils in tropical climates with low organic matter (OM) content result in degradation and fertility loss. It is important to note that humified OM accumulation and stabilization increases soil fertility. This study aimed to characterize humic acids (HA) in sandy soils on an agroecological farm operating for more than 20 years. The structures...
This work aimed to obtain transformed roots of Piper hispidinervium (long pepper) specie recognized for the production of Safrol-rich essential oil, a substance already used for therapeutic and industrial purposes. The roots were obtained from the infection of the plants with strain R1601 of the bacterium Agrobacterium rhizogenes. The results show...
Background . The Procrustean residual vector (or PAM, an acronym for the alternative equivalent term Procrustean association metric) derived from Procrustes analysis can be seen as the univariate form of relationship between two or more data tables, which provides an interesting way for ecologists to place multivariate relationships as the central...
Background . The Procrustean residual vector (or PAM, an acronym for the alternative equivalent term Procrustean association metric) derived from Procrustes analysis can be seen as the univariate form of relationship between two or more data tables, which provides an interesting way for ecologists to place multivariate relationships as the central...
A new species forming glomoid spores in large sporocarps (500–900 × 780–1500 µm), two spore wall layers, being swl1 thin (0,3–0,8 µm), semi-persistent and hyaline to light yellow; swl2 thick (12–30 µm), laminated, orange brown to dark red brown was found in semi-natural ecosystems in Cuba and is herein described as Glomus herrerae.
Plants response to symbiosis with arbuscular mycorrhizal fungi (AMF) under water stress is important to agriculture. Under abiotic stress conditions native fungi are more effective than exotics in improving plant growth and water status. Mycorrhization efficiency is related to soil fungi development and energy cost-benefit ratio. In this study, we...
The ability of rhizospheric humic substances to improve plant growth has been well established by many studies carried out using diverse plant species cultivated under many different conditions. These beneficial effects of humic substances on plant development are expressed in both root and shoot. However, the mechanisms responsible for this action...
The humic acids (HA) from two different vermicompost were extracted, isolated, purified and partially characterized, to evaluate their possible protection in rice (Oryza sativa L.) plants against an hydric stress. Differences in elemental composition, as the coagulation threshold value and E4/E6 relation in their UV-Vis spectra were found. Two conc...
In order to obtain an arbuscular mycorrhizal fungi (AMF) native inoculum from Sierra de Moa and determine the most appropriate conditions for its big scale production, four light and temperature combinations were tested in three plant species (Calophyllum antillanum, Talipariti elatum and Paspalum notatum). Growth and development parameters, as wel...
Abiotic stress is one of the major limiting factors for plant development and productivity, which makes it important to identify microorganisms capable of increasing plant tolerance to stress. Dark septate endophytes can be symbionts of plants. In the present study, we evaluated the ability of dark septate endophytes isolates to reduce the effects...
The family Leguminosae comprises approximately 20,000 species that mostly form symbioses with arbuscular mycorrhizal fungi (AMF) and nitrogen-fixing bacteria (NFB). This study is aimed at investigating and confirming the dependence on nodulation and biological nitrogen fixation in the specie Piptadenia gonoacantha (Mart.) Macbr., which belongs to t...